Spark plug



Jan. 27, 1925. f 1,524,299

' S. GORMAN ET AL SPARK PLUG Filed June 28, '1923 'Patented Jan. 27, 1925.

UNITED'l STATES PATENT ePrice.

STEPHEN'GORMAN `am) WILLIAM H'. c. WARD, or BUrrALo, NEW Yoan.

SPARK PLUG.

Application led June 28,

To all Awhom it may concern:

Be it known that we, STEPHEN GonMAN and VVILLIAAI H. C. WARD, citizens oi the United States, residing at Buiialo, in the county of Eric and State of New York, have invented certain new and useful Improvements in Spark Plugs, of which the following is a specification.

In carrying out the present invention. it is oui`- purpose to provide a spark plug, wherein carbon or oil deposits upon the elec trodesof the plug will be prevented.

We accomplish the above purpose by providing a main electrode having'a assaoe extending longitudinally theret rougzh, whereby upon the intake stroke of the engine piston, a supply of air will be drawn therethrough, for consequently blowing oft carbon or oil deposits from thel electrodes, the plug also including novel means for preventing the discharge of the gases through .said main electrode. i

Yet another object of the invention is to rovide a plug of the above character that 1s comparatively simple of construction, and

- one that maybe manufactured and marketed at but slightly greater cost than plugs now universally used.

The nature of the invention will be better understood when the following detailed description is read in connection with the accompanying drawing, the invention residing in the construction, combination, and arrangement f arts as claimed.

In the drawing forming a part of this an-A plication, like numerals of reference in 1- cate similar parts in the several views, and wherein:

Figure 1 is a 'detail vertical cross section of our improved plug. Fi ures 2 and 3 are eros. sections through certain of the elements included in our plug.

Figure 4 is a tcp plan view of* a still `further elexnent comprising a component parto the plug, and

Figure 5 is a vertical cross section thereof. Our novel plug embodies a' shell 5 of ccnventional form, which is formed at its lower end With an inwardly lient electrode 6 that is adapted for receiving a well known torni of porcelain 7, and that is maintained Within said shell h v a packing gland 8.

Within the porcelain 7 and extending therethrough is Aa main electrode 9, that is formed centrally with an air passage 10 that is of a length equivalent to the length 1923. Serial No. 848,174.

of said electrode. This electrode 9 is :formed with a iange 11 that contacts the usual shoulder formed at the upper end of the usual skirt portion upon said porcelain 7 for obvious purposes. rThe upper end of the electrode 9 'is externally screw threaded as shown in Figure 1, for receiving the usual thumb nut 12, whereby the terminal wire of the vignition circuit may be secured thereto.

In screw 'threaded engagement upon said screw threaded end of the electrode 9 above the thumb nut 12 is a fitting designated generally 13, Which'comprises a neck portion 14, Figure 5, and a circular head ortion 15. ljxtendinfr centrally through sai neck pol.'- tion as welles the headportion of the fitting is an opening that is internally screw threaded at the portion within the neck 14- for engagement upon the screw threaded end of the electrode. The head 15 of this fitting is formed at one side with a well 16, the lower end ot which is formed with an orifice 17, that is so shaped as to provide a seat for a hall valve 18, Figure 1. i

Surrounding the head 15 of said fitting 1? .is a terrule 19, that is preferably shrunk upon said head, and is provided internally adjacent its upper end with a circular ange 20, upon which is positioned a disk 21, and maintained in engagement therewith through any manner desirable.

The electrode Q is provided at a point within the usual skirt portion oi' the porcelain 7 with passages Q2, that communicate with the air passage 10 in the electrode, and in view of the above description when con- .aider-ed in conjunction with the accompanying drawings, it will at once he apparent that in operation. either will be drawn through the main electrode 9 aring the intake stroke of the engine piston for consequently projecting a blast of air upon the secondary electrode 6, aswell as Within the skirt portion ot the porcelain 7, for thereby the most practical embodiment ol the invention with which we are at present familiar, it 1s nevertheless to be understood that minor changes may be made therein, with- -out departing from the spirit and scope of the invention as claimed.

Having thus described our invention, what weelaim as new, and desireeto secure "the second mentioned electrode being pro- Letters Patent, is: --ii vided at points within the body of the spark A spark plug comprising a-:Body having plug with transversely disposed ducts which an electrode, a secon Yelectrode 'passing' communicate at their outer ends with the 15 5 throughlthe vbodyand provided with a duct' interior of the. plug, and at their inner ends extending from end toend thereOLAtleinner with `the. first mentioned duct -at points beend of the duct being 'dis sed o osite the tween the ends thereof, eleotrode'wliich is carried y the ody, valve In testimony whereof we affix our signameans for controlling the admission of air tures. l0 and applied to the outerend of the sec'ond STEPHEN'GORMAN.

mentioned eleetrode and tle duct thereof, WILLIAM H. C.- WARD. 

